Table of Contents
- Introduction
- The Basics of Canna Hardiness
- When to Move Cannas Indoors
- Step-by-Step Guide to Lifting Canna Rhizomes
- Cleaning and Curing for Success
- Best Methods for Storing Canna Bulbs in Winter
- Overwintering Cannas in Containers
- Winter Care and Maintenance
- Preparing for the Next Season
- Conclusion
- FAQ
Introduction
Bringing a touch of the tropics to your backyard is one of the most rewarding parts of the summer gardening season. Canna lilies, with their massive, paddle-like leaves and vibrant, orchid-style blooms, create a lush sanctuary that feels worlds away from the ordinary. At Longfield Gardens, we believe that the joy of growing these stunning plants should last for many years, and our Cannas Bulbs for Sale collection is a great place to start.
Winter care is the key to making that happen. While cannas love the heat of July and August, they need a little extra help to survive the colder months in most parts of the country. This guide is for any gardener who wants to save their favorite varieties and enjoy an even bigger display next summer. If you want a bigger statement in the landscape, our Tall Cannas are an easy next step.
Learning how to handle canna bulbs in winter is a simple process that anyone can master. By following a few straightforward steps, you can keep your plants safe, healthy, and ready to sprout again when the spring sun returns. Success with cannas in winter comes down to three easy steps: lifting the plants, cleaning the rhizomes, and providing a cool, stable storage environment.
The Basics of Canna Hardiness
Before you grab your garden gloves, it is helpful to understand how cannas respond to the cold. In the world of gardening, we often talk about "hardiness," which refers to a plant’s ability to survive the winter outdoors. For a broader overview, see All About Cannas. Cannas are tropical plants that thrive in warm, humid conditions.
In the United States, cannas are generally considered hardy in USDA zones 8 through 11. In these southern and coastal regions, the ground rarely freezes deep enough to harm the plant. If you live in one of these zones, your cannas can usually stay in the ground all year. If you want to compare growing zones before you plant, the USDA Hardiness Zone map is a helpful reference.
However, for gardeners in zones 7 and colder, the winter temperatures will drop low enough to freeze the soil and the plant’s root system. In these areas, cannas are treated as "tender perennials." This means they will live for many years, but only if they are brought indoors before the deep freeze sets in. Keeping them safe is a fun way to build your garden collection without having to buy new plants every year.
Key Takeaway: Know your garden zone to determine if your cannas need to be moved. If your winter temperatures regularly drop below freezing, lifting and storing your plants is the best way to ensure they return.
When to Move Cannas Indoors
Timing is everything when it comes to the health of your plants. You want to give your cannas as much time as possible to soak up energy from the sun. This energy is stored in the underground stems, known as rhizomes, which most people refer to as "bulbs." The more energy the plant stores, the more vigorously it will grow next year. For a classic garden showpiece, Canna Tall Tropicanna is a standout variety.
The best time to begin the winter storage process is right after the first frost. You will know it has happened when the lush green or bronze leaves of your cannas suddenly turn black or dark brown. This might look a bit sad at first, but it is actually a natural and helpful signal. The frost tells the plant to stop growing and move into its dormant phase.
If you live in an area where frost comes very late, you can still lift your cannas in late autumn once the temperatures consistently stay in the 40s. Do not feel rushed to dig them up at the very first sign of autumn. As long as you get them out of the ground before the soil itself freezes solid, your plants will be just fine.
Signs Your Cannas Are Ready for Winter
- The foliage has turned brown or black after a light frost.
- The plant has stopped producing new flowers.
- Soil temperatures are beginning to drop toward the 40-degree mark.
- The stems feel soft rather than firm and turgid.
Step-by-Step Guide to Lifting Canna Rhizomes
Digging up your cannas is a satisfying weekend project. It gives you a chance to see how much your plants have grown underground over the summer. A single rhizome planted in May can often turn into a large clump by October. If you like a bold, upright look for next summer, Canna Tall Australia is worth a look.
To start, you will need a few basic tools. A garden fork is usually better than a shovel for this task. The tines of a fork can slide into the soil and lift the clump without accidentally slicing through the fleshy rhizomes. If you only have a shovel, just be sure to give the plant plenty of "elbow room" as you dig.
Begin by cutting the stalks down to about three or four inches above the soil line. Removing the heavy foliage makes the clump much easier to handle. Next, insert your garden fork into the soil about a foot away from the base of the stems. Gently pry upward, working your way around the entire circle of the plant.
Once the soil is loosened, you can lift the entire mass of rhizomes out of the ground. Do not worry if some soil comes with it; you will clean that off in the next step. If the clump is too heavy to lift all at once, you can use your fork to gently break it into smaller, more manageable pieces.
Cleaning and Curing for Success
After the rhizomes are out of the ground, they need a little bit of preparation before they go into storage. Your goal is to remove the excess garden soil and dry the exterior of the "bulbs" so they do not rot during the winter. If striped foliage is your style, Canna Tall Pretoria is another striking choice.
Start by gently shaking the clump to remove large chunks of dirt. You can use your hands to brush away the remaining soil. Some gardeners like to use a garden hose to wash the rhizomes completely clean. While this makes them look very tidy, it also adds a lot of moisture. If you choose to wash them, you must be extra diligent about the drying process.
"Curing" is a professional term for letting the rhizomes air dry for a few days. Find a cool, dry place that is protected from rain and direct frost, such as a garage or a covered porch. Spread the cannas out in a single layer.
Let them sit for two to four days. During this time, the outer skin will toughen up slightly, and any remaining soil will turn to dust and fall away. This simple step acts as a shield against mold and fungal issues while the plants are resting in their winter home.
What to Look for During Cleaning
- Firmness: Healthy rhizomes should feel heavy and firm, like a fresh ginger root.
- Color: They are usually white, pink, or tan. Avoid anything that looks dark and mushy.
- Eyes: Look for small bumps or "eyes." These are the points where new growth will emerge in the spring.
Best Methods for Storing Canna Bulbs in Winter
Now that your cannas are clean and dry, it is time to pack them away. For a more detailed walkthrough, see How to Store Canna Bulbs for Winter. The environment you choose is the most important factor in whether they survive until spring. They need a spot that is "cool but not cold."
The ideal temperature for storing canna bulbs is between 40°F and 50°F. If the area is too warm, the plants might think it is spring and start to grow in the dark. If the area is too cold (below freezing), the cells in the rhizome will rupture, and the plant will perish.
Choosing Your Storage Container
You have several great options for containers. Cardboard boxes, plastic bins with air holes, or even heavy paper bags work well. The key is to ensure there is a little bit of air circulation so moisture doesn't get trapped.
Selecting a Packing Medium
We have tested various methods at Longfield Gardens to find what works best for home gardeners. To keep the rhizomes from drying out completely, it helps to pack them in a moisture-regulating material.
- Peat Moss: This is a classic choice because it holds just enough moisture to keep the rhizomes plump.
- Wood Shavings: Often sold as pet bedding, these are inexpensive and provide excellent insulation.
- Vermiculite or Perlite: These lightweight minerals are great for preventing rot.
- Newspaper: You can also simply wrap each clump in several layers of dry newspaper.
Place a layer of your chosen material in the bottom of the container. Lay the cannas on top, making sure they aren't squeezed too tightly together. Cover them with more material and continue layering until the container is full.
What to do next:
- Label your containers with the variety name and the date.
- Move the containers to a dark, cool spot like a basement or an insulated crawlspace.
- Set a reminder on your calendar to check them once a month.
Overwintering Cannas in Containers
Many gardeners choose to grow cannas in large pots to decorate patios and decks. If your cannas are already in containers, the winter storage process is even easier. You don't necessarily have to dig the rhizomes out of the soil. For smaller plantings and patio spaces, browse Short Cannas.
Once the first frost hits, cut the foliage back to the soil level just as you would with garden-planted cannas. Instead of digging, simply move the entire pot into a frost-free area. A cool basement or a garage that stays above freezing is perfect.
Keep the soil in the pot almost completely dry throughout the winter. Because the rhizomes are dormant, they do not need regular watering. A tiny sip of water once every few weeks is enough to keep the soil from becoming bone-dry. In the spring, you can move the pot back outside, start watering again, and watch the new shoots emerge.
Winter Care and Maintenance
Storage is not quite a "set it and forget it" task. To ensure the best results, you should check on your canna bulbs about once a month. This small effort allows you to catch any minor issues before they become big problems. For a full lift-and-divide walkthrough, see How to Divide and Store Canna Bulbs for Winter.
When you open your storage boxes, look for two things: rot and shriveling. If you notice a rhizome that feels soft or smells funny, it is likely beginning to rot. Remove it immediately and throw it away so the rot doesn't spread to the healthy plants. This is an example of a "simple win" in the garden—removing one bad apple saves the whole barrel.
If the rhizomes look very wrinkled or feel light and "corky," they might be drying out too much. This often happens in homes with very low humidity. If this occurs, use a spray bottle to lightly mist the packing material with water. You don't want it to be wet; just a hint of dampness is enough to rehydrate the plants.
Healthy Winter Checklist
- Check temperature: Ensure the storage area hasn't become too hot or too cold.
- Inspect for pests: Occasionally, mice might find storage boxes attractive. Use lids if necessary.
- Monitor moisture: Packing material should feel like a wrung-out sponge, not a wet one.
Preparing for the Next Season
As the days get longer and the snow begins to melt, you will start to see signs of life in your stored cannas. You might notice small white or pink "eyes" beginning to swell on the rhizomes. This is an exciting sign that your winter care has been a success!
You can start your cannas indoors about four to six weeks before the last expected frost date in your area. This "head start" is a great way to get earlier blooms. If you’d like to get a head start indoors, How to Start Canna Lily Bulbs Indoors is a helpful guide.
If you prefer to plant directly into the garden, wait until the soil is warm. A good rule of thumb is to wait until the weather is warm enough to wear a t-shirt comfortably outside. Cannas love warm soil, so planting them too early when the ground is cold and soggy can slow them down.
When you are ready to plant, you can also divide your large clumps. Use a sharp, clean knife to cut the rhizomes into pieces. Make sure each piece has at least one or two healthy-looking "eyes." This is the best way to expand your garden for free and share beautiful varieties like 'Peach Blush' or 'Dwarf Pink Futurity' with friends and neighbors.
Conclusion
Caring for canna bulbs in winter is a simple and rewarding part of the gardening cycle. It bridges the gap between the lush beauty of summer and the quiet anticipation of spring. By taking the time to lift, clean, and store your rhizomes properly, you are preserving a piece of your garden’s history and ensuring an even more spectacular display for the coming year.
Gardening is all about these small, rhythmic tasks that connect us to the seasons. There is a deep satisfaction in tucking your plants away for a winter nap and seeing them wake up full of energy a few months later. Whether you are growing 'Cannasol Happy Carmen' for its brilliant red flowers or 'Caballero' for its tropical yellow speckles, the effort you put in now will pay off in height, color, and drama. For order timing and delivery details, see our Shipping Information page.
- Lift cannas after the first frost has turned the foliage dark.
- Cure the rhizomes in a dry spot for a few days before packing.
- Store in a cool, dark place between 40°F and 50°F.
- Check for moisture once a month to keep the rhizomes healthy.
We invite you to explore our wide selection of flower bulbs and perennials at Longfield Gardens to find the perfect companions for your summer landscape. Taking care of your plants is a journey, and we are happy to provide the support and quality you need for a beautiful home garden. Our 100% Guarantee is there to back your purchase.
Success in the garden comes from working with nature. By giving your cannas a safe place to rest during the winter, you are setting the stage for a vibrant, tropical summer.
FAQ
Can I leave cannas in the ground during winter?
Whether you can leave cannas in the ground depends on your USDA hardiness zone. If you live in Zone 8 or warmer, the ground usually stays warm enough for cannas to survive with just a thick layer of mulch. However, in Zone 7 and colder, the soil freezes deep enough to damage the rhizomes, so they must be lifted and stored indoors to survive.
What is the best temperature for storing canna bulbs?
The ideal temperature range for storing canna rhizomes is between 40°F and 50°F. This range is cool enough to keep the plant in a dormant state but warm enough to prevent the cells from freezing. Common storage locations that maintain these temperatures include unheated basements, insulated garages, or cool crawlspaces.
My stored canna rhizomes look shriveled—what should I do?
Shriveling is a sign that the rhizomes are losing too much moisture to the air. If you notice this during your monthly check, use a spray bottle to lightly mist the packing material (like peat moss or wood shavings) with water. You want the material to be slightly damp, which will help the rhizomes rehydrate without becoming so wet that they begin to rot.
Should I wash the dirt off cannas before storing them?
You can wash the dirt off, but it is not strictly necessary and requires extra drying time. Most gardeners find it easier to simply shake off the loose soil and let the rhizomes dry for a few days. Once the remaining soil is dry, it usually brushes off easily with your hands, which keeps the rhizomes drier and reduces the risk of fungal growth during storage.